Alert archive / Wyoming / Tornado Warnings in 1991

Tornado Warning 3, NWS Cheyenne, WY

May 19, 1991Laramie County, Wyoming

NWS Cheyenne, WY issued this tornado warning at May 19, 1991, 5:15 PM MDT for Laramie County, Wyoming. It was in force for 30 min. 1 report came from inside the area while it was in force.

The area

The counties it named, with what was reported inside it.

The facts

Issued: May 19, 1991, 5:15 PM MDT (23:15 UTC)
Expired: May 19, 1991, 5:45 PM MDT
In force: 30 min
Issued by: NWS Cheyenne, WY
Area: Whole counties

County Laramie County, WY

What was reported inside it

Time	Report	Where	Remark
May 19, 5:45 PM MDT	Thunderstorm Wind 0	Laramie, WY

NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in. Storm Data before 1996 records only tornadoes, thunderstorm wind and hail.

The nearest sounding before it

Denver, CO (KDEN), launched 12:00Z, 11.3 hours before the alert went out and 202 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 152 J/kg
Mixed-layer CIN: -330 J/kg
Mixed-layer LCL: 1662 m above ground
0-6 km bulk shear: 32 kt
0-1 km storm-relative helicity: 84 m²/s²
0-3 km storm-relative helicity: 50 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
TTAA00 KCYS 192315
TORCYS
WYC021-192345-

BULLETIN - IMMEDIATE BROADCAST REQUESTED/EBS ACTIVATION REQUESTED 
TORNADO WARNING 
NATIONAL WEATHER SERVICE CHEYENNE WY
515 PM MDT SUN MAY 19 1991

THE NATIONAL WEATHER SERVICE HAS ISSUED A TORNADO WARNING 
EFFECTIVE UNTIL 545 PM MDT FOR PEOPLE IN THE FOLLOWING COUNTY

   IN THE SOUTHEAST PART OF WYOMING
      SOUTHERN LARAMIE COUNTY

THIS WARNING INCLUDES THE FOLLOWING TOWNS OR CITIES... CHEYENNE.

AT 514 PM MDT A SEVERE THUNDERSTORM WAS IN PROGESS OVER THE
CITY OF CHEYENNE. DIME SIZED HAIL WAS ALREADY REPORTED WITH THIS
STORM. SEVERAL FUNNEL CLOUDS HAVE ALSO BEEN REPORTED. THE STORM
WAS MOVING NORTH AT 20 MILES AN HOUR.

IF YOU ARE CAUGHT OUTSIDE...SEEK SHELTER IN A} NEARBY REINFORCED
BUILDING.  AS A LAST RESORT...SEEK SHELTER IN A DITCH OR LOW SPOT
AND COVER YOUR HEAD WITH YOUR HANDS.

MENTZER

What forecasters said that day

The local office's own words before this tornado warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

In the hours before

Special weather statement, May 19, 5:03 PM MDT, 12 minutes before

WYZ006-011-012-017-200000-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHEYENNE WY
505 PM MDT SUN MAY 19 1991

...A TORNADO WATCH HAS BEEN POSTED FOR NORTHEAST AND EAST CENTRAL
WYOMING UNTIL 11 PM...WITH A SEVERE THUNDERSTORM WATCH UNTIL 11 PM
IN THE FAR SOUTHEAST...

CONDITIONS ONCE AGAIN WERE RIPE FOR SEVERE THUNDERSTORMS OVER MUCH OF
EASTERN WYOMING LATE THIS SUNDAY AFTERNOON INTO THIS EVENING.  HAIL...
STRONG DAMAGING WINDS...AND qPOSSIBLY EVEN A TORNADO COULD OCCUR WITH
A FEW OF THE STORMS.

PEOPLE IN EASTERN WYOMING SHOULD BE ALERT TO THE WEATHER CONDITIONS IN
YOUR AREA...AND MONITOR THIS RADIO STATION FOR FURTHER INFORMATION AND
POSSIBLE WARNINGS.

JAD

The office that day

Everything else NWS Cheyenne, WY issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 18, 7:30 PM MDT	Severe Thunderstorm Warning	CYS	Laramie	45 min
May 18, 8:11 PM MDT	Severe Thunderstorm Warning	CYS	Laramie	49 min
May 19, 4:59 PM MDT	Severe Thunderstorm Warning	CYS	Goshen, Laramie	61 min
May 19, 5:44 PM MDT	Severe Thunderstorm Warning	CYS	Goshen, Laramie	61 min

Nearby

Tornado Warnings in Wyoming, 1991 Every tornado warning in 1991 Tornadoes in 1991

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.